The OUSPT Full-Face Snorkel Mask

What was marketed as a panoramic "breathe-easy" window into the underwater world has instead become a potential death trap for unsuspecting snorkelers.

On March 5, 2026, the U.S. Consumer Product Safety Commission (CPSC) issued an urgent warning to immediately stop using OUSPT full-face snorkel masks following reports of labored breathing, loss of consciousness, and allegations that the masks caused a drowning fatality. The warning states that carbon dioxide (CO2) buildup in the masks can "exacerbate the difficulty of breathing." While the 84,000 OUSPT masks sold on Amazon from March 2019 through February 2026 are the current focus of federal scrutiny, they may represent a "canary in the coal mine" for millions of snorkelers who are using other brands of full-face gear.

Design Flaws: The Risk of Rebreathing Carbon Dioxide

Unlike traditional snorkeling gear that uses a separate mask and mouthpiece, full-face snorkel masks cover your entire face in a single, integrated unit. The full-face masks allow snorkelers to breathe out of their mouth and nose, whereas traditional equipment only allows you to breathe from your mouth through the snorkel tube.

Full-face snorkel masks are designed with internal valves to keep the air you breathe in separate from the air you breathe out. However, research shows that the seals often fail to work perfectly, especially if the mask doesn't fit your face shape exactly. When the seal leaks, exhaled breath gets trapped in the large "dead space" inside the mask instead of being pushed out through the snorkel tube. This causes you to breathe your CO2 back into your lungs, a process known as "rebreathing."

As CO2 builds up inside the mask, your body's natural alarm system triggers a distressing feeling called "air hunger," which makes you feel like you can't get enough oxygen. This can quickly lead to shortness of breath, dizziness, and confusion. In serious cases, rebreathing too much CO2 can cause a person to lose consciousness. Because this risk is tied to the mask's large internal design and its reliance on a perfect seal, these dangers can happen across many different brands and are especially high when you are swimming hard or breathing heavily.

Beyond the risks of rebreathing exhaled CO2, full-face snorkel masks contain several inherent design features that can make them significantly less safe than traditional gear, according to a study conducted by the Hawaii Department of Health.

In 2019, the Department of Health launched a Snorkel Safety Study to find answers to a mysterious and alarming spike in snorkeling deaths that occurred in "mild ocean conditions and were not accompanied by signs of distress." This trend became particularly noticeable after the first recreational full-face snorkel masks entered the marketplace in 2014 and were quickly imitated by low-cost knockoffs which the original manufacturer claims lack the precision airflow systems, medical-grade testing, and high-quality materials necessary to prevent dangerous respiratory failures.

Data from Hawaii shows that from 2010 to 2014, there were 82 snorkel-related drownings among visitors to the islands. When the masks became widely available, that number spiked to 114 between 2015 and 2019. Without citing specific brands, the Snorkel Safety Study identified several "adverse features" of full-face masks, including:

• Cannot be removed easily in urgent situations even with quick release features
• Cannot "spit out" mouthpiece in urgent situations
• Cannot clear water from tube with sharp expiratory force maneuver
• Cannot dive beneath the surface safely
• Valve malfunction may lead to serious aspiration consequences

It is safety issues such as these that have led some snorkeling stores, tour companies, and resorts -- from Hawaii and beyond -- to either refuse to carry or to stop carrying full-face masks. The founder of one of Hawaii's top snorkeling equipment shops has refused to sell the masks, citing hazards like overheating, a sense of claustrophobia, and the inability to reach one's nose to "clear." He also warned that the seal can stick during a panicked attempt at removal, making the design particularly dangerous in emergencies. He told the news media: "I get three or four inquiries a week from Chinese manufacturers. 'You must carry these. Please send your address. We'll send samples.' And my response is always the same, 'No, thank you. Please put them in the dumpster.'"

But while many dive professionals refuse to stock full-face masks, many consumers buy them on e-commerce sites like Amazon, Temu, and eBay, unaware of the technical risks and falsely believing they are safe. One such consumer was Nancy Peacock.

The Human Cost of Full-Face Snorkel Masks

In September 2016, Peacock -- who was described by her husband as an avid snorkeler and a "good swimmer" -- died while snorkeling in Hawaii while trying out a full-face mask that she had purchased on Amazon. Despite her experience and the fact that she had practiced using her newly purchased mask in a local swimming pool prior to her trip, she was found floating face-up less than an hour after entering the water. Her water-filled mask was found pulled up, exposing her mouth and nose, a detail that her husband believes was a sign of a desperate emergency. "The fact that the mask was pulled partly off suggests something went wrong, suddenly, and she tried to get the thing off. Too late," he wrote in a column for a Hawaii news site.

But the mask -- a potential source of answers -- went missing after Peacock was recovered, and neither the coroner nor ocean safety officials considered the equipment in their investigation. In his grief, Peacock's husband successfully campaigned for Hawaii officials to begin collecting equipment data from drowning scenes and raised public awareness about the risks of the masks.

Survivors Recount Full-Face Snorkel Mask Emergencies

Beyond the data from drowning fatalities, the accounts of survivors who escaped life-or-death emergencies while wearing full-face masks provide critical insight into the equipment's risks. Reports made to the CPSC through its SaferProducts.gov public database include:

• A 44-year-old snorkeler described a terrifying emergency when a deep gasp for air caused her mask to suction tightly to her face, leaving her unable to breathe. Struggling in deep water without the ability to plant her feet for leverage, she was barely able to peel the mask away just as she "started to black out. She likened the ordeal to the sensation of "gasping with a plastic bag stuck to [her] face."

• A snorkeler with 30 years of experience became "totally exhausted" and breathless while attempting to swim to shore while wearing a full- face mask and kept asking himself: "Why is this so hard?! What's wrong with me?!" When his friends realized that he was in distress, they dragged him to the beach. When he took off his mask, his lips were "totally blue." The snorkeler reported to the CPSC that he has "come to believe that [full-face masks] pose an inherent danger, since they will compromise the survivability of anyone who encounters unexpected conditions that require them to swim hard, using sustained strong effort."

• A 60-year-old snorkeler who was wearing a full- face mask had trouble breathing and moving through the water after using the mask for only 20 minutes. When he returned to shore, he lost consciousness, required CPR, and was taken to a hospital where he was intubated and placed on a ventilator for several hours. He was ultimately diagnosed as having CO2 poisoning. His wife learned of the dangers of full-face masks from a passerby on the beach who saw her holding his mask as the emergency unfolded.

• A husband and wife who were using full-face masks in a cove with "little or no waves" both "almost passed out" and were pulled back to shore by a guide. The husband reported that they could barely walk and that his lungs hurt after the incident. He reported what happened to the mask manufacturer the next day and was told that it was either their fault or the ocean's fault.

Hawaii's Snorkel Safety Study included a voluntary survey of people who had "gotten into trouble" while snorkeling. Of 131 participants, 37 percent reported that they were wearing full-face gear. When asked what they would have done differently to have prevented the incident, the overwhelming response was that they would not have used a full-face mask.

This is a blog posted by the attorneys of Feldman Shepherd in Philadelphia, PA (https://tinyurl.com/348u6s5v) and reprinted with their permission. We have taken the liberty to shorten it.